I know that SLP has their clutch kit with their pipe. I know that Carls also has a clutch kit. I am looking for what others have done and think. I don't care about running across the lake. I prefer on and off throttle and wide open clutching on the hill. Speed across the lake doesn't mean anything to me. Here are the specs that I have found on Stock, SLP, and Carls kits.
Stock Polaris
Primary Spring = 120-320
Weight = 10-64
Secondary Spring = 155-222
Helix = Straight 40
SLP Pipe Kit
Primary Spring = 140-340
Weight = 10-68 MTX adjustable weight kit
Secondary Spring = 155-222
Helix = Straight 40
Carls Cycle
Primary Spring = 120-320
Weight = 10-66 stock or Belly busters
Secondary Spring = 155-222
Helix = 64/42
Stock Polaris
Primary Spring = 120-320
Weight = 10-64
Secondary Spring = 155-222
Helix = Straight 40
SLP Pipe Kit
Primary Spring = 140-340
Weight = 10-68 MTX adjustable weight kit
Secondary Spring = 155-222
Helix = Straight 40
Carls Cycle
Primary Spring = 120-320
Weight = 10-66 stock or Belly busters
Secondary Spring = 155-222
Helix = 64/42